Dual Rotor Rotary Electric Machine Vibration Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing rotary electric machines experience vibration due to non-uniform magnetic flux distribution caused by the alternation of magnet-based and iron pole portions in the rotor, leading to inefficiencies in magnetic flux application to the stator.
Innovation Solution
The rotary electric machine design incorporates a configuration where two rotors with alternating magnet-based and iron pole portions are arranged on the same axis, with field yokes and coils generating magnetic flux to achieve uniform magnetic flux distribution, reducing vibration and improving torque efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single rotor with alternating magnet-based and iron pole portions is used, then the rotor structure is simple and cost-effective, but the magnetic flux distribution becomes non-uniform causing vibration
Solution Approach 1:
The rotor is divided into two separate rotors (first rotor and second rotor) that are coupled together. The first rotor has magnet-based magnetic pole portions while the second rotor has iron core magnetic pole portions. This segmentation allows each rotor to contribute differently to the magnetic flux distribution, achieving uniform overall flux while maintaining structural simplicity and cost-effectiveness.
Solution Approach 2:
The first rotor and second rotor are coupled together to form a combined rotor assembly. The magnetic pole portions of both rotors work together to generate uniform magnetic flux distribution. By merging two rotors with complementary characteristics, the invention achieves uniform flux distribution that reduces vibration while maintaining the simplicity of consequent pole type rotors.
2Ease of manufacture
If magnet-based and iron pole portions are alternately arranged in a single rotor, then manufacturing cost is reduced, but torque efficiency decreases due to non-uniform magnetic flux
Solution Approach 1:
The rotor functionality is segmented between two rotors: the first rotor provides magnet-based magnetic pole portions for cost-effective manufacturing, while the second rotor provides iron core magnetic pole portions for uniform flux distribution. This segmentation enables both cost reduction and torque efficiency improvement.
Solution Approach 2:
Different regions of the combined rotor assembly have different qualities: the first rotor uses permanent magnets for specific magnetic pole portions while the second rotor uses iron cores for other portions. This local differentiation in material quality achieves uniform magnetic flux distribution, improving torque efficiency while maintaining manufacturing cost benefits.
3Object-affected harmful factors
If field coils are added to control magnetic flux uniformity, then vibration is reduced, but device complexity increases
Solution Approach 1:
The field coils are integrated into the combined rotor assembly, with first field coils associated with the first rotor and second field coils associated with the second rotor. This merging of field control functionality into the rotor structure itself achieves vibration reduction without significantly increasing overall device complexity.
Solution Approach 2:
The field coils are configured to generate magnetic flux that directly contributes to the overall magnetic field between the rotors and stator. The field coils serve dual purposes: controlling flux distribution uniformity to reduce vibration while also contributing to torque generation, thereby minimizing the impact on device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances the uniformity of magnetic flux directionality and density, reducing rotor vibration and improving torque performance by controlling the magnetic flux through individual adjustment of field coil currents.
Implementation Method 1
a field coil that is energized to generate a field-based magnetic flux
Implementation Method 2
a first magnet-based magnetic pole portion having the first polarity and formed by the first permanent magnets, and a second magnet-based magnetic pole portion having the second polarity and formed by the second permanent magnets
Data Source
AI summary
A rotary electric machine includes: a rotary shaft member; first and second rotor including first and second rotor core, respectively, including first and second permanent magnets having first and second polarity, first and second magnet-based magnetic pole portions having the first and the second polarities and being formed by the first and the second permanent magnets, and first and second iron core portions having the second and the first polarities and being formed by iron pole portions of the first and the second rotor core, are alternately arranged in a circumferential direction of the first rotor core; a stator; and a field yoke. Further, the first magnet-based magnetic pole portion and the second iron pole portion face each other and the first iron pole portion and the second magnet-based magnetic pole portion face each other in the axial direction.